Metal oxide arrester electrification test experiment research system

Abstract

The invention discloses a metal oxide arrester electrification test experiment research system, which includes: a 110kV main transformer of transformer substation, a bus line, a three-phase metal oxide arrester, a pressure regulator, an arrester leakage electric current testing instrument with electrification, an equivalent salt density solution spraying device and a thermal infrared imager. The metal oxide arrester electrification test experiment research system sets the pressure regulator to change the system operation voltage, the equivalent salt density solution spraying device and the monitoring device running temperature of the thermal infrared imager, which is easy to study the corresponding relation between the change rate of the equipment running temperature and the change rate of the MOA resistive elective current. By further setting the arrester pillar roller track, the system can change the MOA three-phase space position to simulate the operating condition change of the MOA surrounding device. The system is practical for training and teaching or experimental verification. The system can also effectively check the good or worse performance of different MOA leakage electric current test equipment with electrification.

Description

Technical field [0001] The invention relates to the technical field of live testing of equipment in power systems, and in particular to a live testing and research system for metal oxide arresters. Background technique [0002] At present, the metal oxide arrester (hereinafter referred to as "MOA") in the substation has been subjected to the operating phase voltage of the system for a long time. Under such factors as aging, humidity, pollution and overvoltage, it may cause the valve to gradually deteriorate, resistive current and active power. The increase will eventually lead to the destruction of the insulation properties, so it is very necessary to detect the pros and cons of its performance through the live test of MOA. [0003] MOA live test is an important detection method: under the normal operating conditions of MOA, the full current and resistive component through the valve are measured, and the initial value difference is combined to judge the deterioration of the valve. ...

AI Technical Summary

Problems solved by technology

However, the corresponding relationship between the changes in the operating conditions of the equipment around the MOA and the test of the MOA resistive current remains to be further studied.

[0009] In addition, non-standard test equipment or test methods may also affect the MOA live test, such as insufficient power of the voltage signal wireless transmitter device of the test equipment, signal interference, virtual grounding of the test equipment, and unsatisfactory test accuracy of the test equipment. May cause inaccurate MOA live test data

[0010] In summary, the impact of various factors such as system operating voltage fluctuations, the degree of contamination on the surface of the porcelain bushing, the operating temperature of the MOA, changes in the operating conditions of equipment around the MOA, non-standard test equipment or test methods, etc. Both have a great impact. Although many units have discovered these phenomena during the MOA resistive current live test process, there are currently few domestic institutions that have carried out some relevant research on the above three aspects, and the research content is not deep enough to form more valid conclusion

Restricted by the reliability of power supply, power system equipment cannot be tested and verified by power failure at any time, and it is impossible to conduct in-depth research on these influencing factors of MOA

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